After unplugging external display, the Xfce session isn't resumed correctly

[Pasi Lallinaho]

After turning the HDMI display off with xrandr and unplugging the HDMI cable, the Xfce session isn't resumed correctly. Some of the symptoms include:
  1) Lost theming; GTK and icon themes change
  2) Keyboard shortcuts do not work
  3) User configuration not used; eg. xfce4-terminal uses the default font
  4) When opening Thunar or the terminal, the default location is /, not /home/username as usually

Running xfsettingsd fixes symptoms 1 and 2, but symptoms 3 and 4 stick until reboot; can't check whether a logout would work, since there doesn't seem to be a session to log out from.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xfce4-session 4.11.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-33.44-generic 3.16.7-ckt7
Uname: Linux 3.16.0-33-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
Date: Tue Mar 31 15:59:31 2015
InstallationDate: Installed on 2012-08-06 (966 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: xfce4-session
UpgradeStatus: Upgraded to utopic on 2015-02-18 (40 days ago)